Seems like we are starting to make a small dent (down to 3.253.593) . I have been annotating life stages in my home state for a few weeks now and got them from 20k missing down to about half of that.
That only worked because of this tool
https://forum.inaturalist.org/t/announcing-the-universal-metadata-tool-beta/53182/129
I know it can’t be use for everything but butterfly life stages are so easy to tell apart most times, that this makes things super quick